EAT is very sensitive to voltage drops, if battery is low will get M&S flashing prior to or during turning the engine over; if it starts alright but spikes down on revving up it could certainly be the alternator.
If the CAN bus comms are missing or interrupted the EAT will go immediately into limp mode. Reading EAT fault codes with Nanocom will tell.
Also possibly overboosting, usually boils down to a leaky/parted/disconnected wastegate hose.
Rgds
Matt


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